Max O3, last 14 days

O₃ concentrations per day (µg/m³), 07/08/2026 - 20/08/2026

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- Click on the figures in the table cells to get an evolution graph of daily concentrations
- Click on the date to get an interpolation map
- "NA" means no or not enough data were available
[O₃]"ozone day" : day with at least one exeedance in Belgium of the EU threshold for information of the public (180 μg/m3)

Code city 07/08 08/08 09/08 10/08 11/08 12/08 13/08[O₃]
14/08[O₃]
15/08[O₃]
16/08 17/08 18/08 19/08 20/08

41B011 Sint-Agatha-Berchem 109 141 136.5 124.5 108 144 147.5 174 152 92 97 51 61.5 65.5

41MEU1 Neder-Over-Heembeek 108 141.5 133 124 103 138.5 138 168 136.5 92.5 100 55 53.5 63.5

41N043 Voorhaven (Haren) 100 133 123.5 110.5 96.5 132 133 153.5 124.5 82 92.5 45 53 56.5

41R001 Sint-Jans-Molenbeek 98 133.5 129 103.5 96.5 137.5 130.5 156.5 135 87 95 48 59.5 60

41R012 Ukkel 106.5 131 133 124 111.5 144.5 144.5 172 146 94 100.5 48.5 59.5 61.5

42N016 Dessel 94.5 131.5 143 128.5 96.5 154 155 206 125 95.5 90 45 64 70

42N027 Bree 97 144 154 138 97.5 160 156 214.5 138 92.5 97 51 65.5 78

42N035 Aarschot 106 145 150.5 137 109 152 161 199.5 151 93.5 110 52 68 76

42N040 Sint-Pieters-Leeuw 107.5 130.5 132 123.5 112 143.5 145.5 174.5 156.5 95 98 52.5 63.5 64.5

42N046 Gellik 98.5 142.5 146 152.5 117.5 139.5 152.5 210 154.5 92.5 112 43.5 73.5 78.5

42N047 Hasselt 99.5 135.5 144 136.5 114.5 151 157.5 207 149 88 100.5 49 69.5 74

42R801 Borgerhout 100.5 134 139.5 126 97 141.5 168 187 123.5 92 94 52.5 61.5 68

42R811 Schoten 96.5 133 143.5 130.5 97.5 150 169.5 203 120 86 92.5 46 64 74

42R842 Mechelen (Hendrik Speecqvest) 97.5 130 127 114 93.5 141.5 130 169 122 82 92 50.5 54 64

44M705 Roeselare (Haven) 116.5 129.5 149.5 117.5 102 146 169.5 199.5 132.5 96 105.5 65 69.5 76.5

44N012 Moerkerke 112 150.5 143.5 122 102 157 182 210.5 99.5 90.5 95.5 69.5 58.5 74

44N029 Houtem (Veurne) 116 148.5 148.5 122.5 115.5 158.5 179.5 207 97.5 92.5 104.5 66.5 70.5 74

44R701 Gent (Baudelopark) 118 143.5 147 125.5 103.5 147 155.5 192 143.5 85.5 101 58.5 65 71.5

44R710 Destelbergen 122.5 148 156 131 109 155 158.5 203 149 90 101.5 61.5 61.5 75.5

43N060 Havinnes 110.5 128 117.5 122 110.5 131 141.5 186.5 163 94 106 54.5 53.5 63.5

43N064 Rixensart 115 130 140.5 121.5 121 148 149 174 167.5 100.5 106.5 51.5 71 70.5

43N066 Eupen 104.5 131 127 146.5 108 119.5 129 188.5 170 102.5 101.5 66 63 73

43N070 Mons 105 126 92 115 105 133.5 154 166 191.5 88 102 35.5 47 48.5

43N073 Vezin 105 129 131 130.5 104.5 130.5 163 173 174 101.5 100 45 68 67

43N085 Vielsalm 98 120 118 131 100.5 104 131 166.5 157 125.5 81 39.5 73 70.5

43N093 Sinsin 106 125 139 133 113.5 120.5 133.5 166 167.5 122 101 52 68.5 81.5

43N100 Dourbes 117 130 132.5 142 126 137 149.5 176 184 137 118 58 76 82

43N113 Saint-Ode 112 130 137 136 99 104.5 136 165.5 158 133 104.5 67 82 87.5

43N121 Offagne 110 130.5 136 136.5 104 105.5 147 154 158 130 101 51.5 85 90.5

43N132 Habay-La-Neuve 103.5 137.5 135.5 125.5 103.5 106.5 157 153.5 153 136.5 93 52 74 89.5

43R221 Herstal 100 134.5 143 135.5 104 127 147 190.5 177 98.5 103.5 55 63.5 72

43R222 Liège (ISSeP) 106 135.5 138.5 131.5 110.5 129 148.5 174.5 184 105.5 102 62 68.5 73

43R240 Engis 100 124 125.5 121 103 125 149.5 174 176.5 92.5 91.5 46 58 63.5

43R401 Namur 99.5 125 132 129.5 100 123 151.5 158.5 173.5 107 97.5 50 71 70.5

45R502 Lodelinsart 114 130.5 124.5 127.5 106.5 136 142.5 165 185.5 103 101.5 37.5 61 58

Interpolated spatial average in :
Brussels 105 133 130 120 105 140 138 166 142 90 99 47 60 63
Flanders 106 136 141 121 104 145 155 188 128 89 99 53 64 72
Wallonia 105 127 125 123 105 119 141 163 162 111 99 47 67 72
Belgium 105 131 132 122 105 130 147 174 147 101 99 50 65 72

% of the population exposed to O₃ concentrations > 180 μg/m³ in:
Brussels 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0%
Flanders 0% 0% 0% 0% 0% 0% 1% 68% <1% 0% 0% 0% 0% 0%
Wallonia 0% 0% 0% 0% 0% 0% <1% 4% 4% 0% 0% 0% 0% 0%
Belgium 0% 0% 0% 0% 0% 0% <1% 41% 1% 0% 0% 0% 0% 0%

% of the population exposed to O₃ concentrations > 240 μg/m³ in:
Brussels 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0%
Flanders 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0%
Wallonia 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0%
Belgium 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0%

Code	city	07/08	08/08	09/08	10/08	11/08	12/08	13/08[O₃]	14/08[O₃]	15/08[O₃]	16/08	17/08	18/08	19/08	20/08
41B011	Sint-Agatha-Berchem	109	141	136.5	124.5	108	144	147.5	174	152	92	97	51	61.5	65.5
41MEU1	Neder-Over-Heembeek	108	141.5	133	124	103	138.5	138	168	136.5	92.5	100	55	53.5	63.5
41N043	Voorhaven (Haren)	100	133	123.5	110.5	96.5	132	133	153.5	124.5	82	92.5	45	53	56.5
41R001	Sint-Jans-Molenbeek	98	133.5	129	103.5	96.5	137.5	130.5	156.5	135	87	95	48	59.5	60
41R012	Ukkel	106.5	131	133	124	111.5	144.5	144.5	172	146	94	100.5	48.5	59.5	61.5
42N016	Dessel	94.5	131.5	143	128.5	96.5	154	155	206	125	95.5	90	45	64	70
42N027	Bree	97	144	154	138	97.5	160	156	214.5	138	92.5	97	51	65.5	78
42N035	Aarschot	106	145	150.5	137	109	152	161	199.5	151	93.5	110	52	68	76
42N040	Sint-Pieters-Leeuw	107.5	130.5	132	123.5	112	143.5	145.5	174.5	156.5	95	98	52.5	63.5	64.5
42N046	Gellik	98.5	142.5	146	152.5	117.5	139.5	152.5	210	154.5	92.5	112	43.5	73.5	78.5
42N047	Hasselt	99.5	135.5	144	136.5	114.5	151	157.5	207	149	88	100.5	49	69.5	74
42R801	Borgerhout	100.5	134	139.5	126	97	141.5	168	187	123.5	92	94	52.5	61.5	68
42R811	Schoten	96.5	133	143.5	130.5	97.5	150	169.5	203	120	86	92.5	46	64	74
42R842	Mechelen (Hendrik Speecqvest)	97.5	130	127	114	93.5	141.5	130	169	122	82	92	50.5	54	64
44M705	Roeselare (Haven)	116.5	129.5	149.5	117.5	102	146	169.5	199.5	132.5	96	105.5	65	69.5	76.5
44N012	Moerkerke	112	150.5	143.5	122	102	157	182	210.5	99.5	90.5	95.5	69.5	58.5	74
44N029	Houtem (Veurne)	116	148.5	148.5	122.5	115.5	158.5	179.5	207	97.5	92.5	104.5	66.5	70.5	74
44R701	Gent (Baudelopark)	118	143.5	147	125.5	103.5	147	155.5	192	143.5	85.5	101	58.5	65	71.5
44R710	Destelbergen	122.5	148	156	131	109	155	158.5	203	149	90	101.5	61.5	61.5	75.5
43N060	Havinnes	110.5	128	117.5	122	110.5	131	141.5	186.5	163	94	106	54.5	53.5	63.5
43N064	Rixensart	115	130	140.5	121.5	121	148	149	174	167.5	100.5	106.5	51.5	71	70.5
43N066	Eupen	104.5	131	127	146.5	108	119.5	129	188.5	170	102.5	101.5	66	63	73
43N070	Mons	105	126	92	115	105	133.5	154	166	191.5	88	102	35.5	47	48.5
43N073	Vezin	105	129	131	130.5	104.5	130.5	163	173	174	101.5	100	45	68	67
43N085	Vielsalm	98	120	118	131	100.5	104	131	166.5	157	125.5	81	39.5	73	70.5
43N093	Sinsin	106	125	139	133	113.5	120.5	133.5	166	167.5	122	101	52	68.5	81.5
43N100	Dourbes	117	130	132.5	142	126	137	149.5	176	184	137	118	58	76	82
43N113	Saint-Ode	112	130	137	136	99	104.5	136	165.5	158	133	104.5	67	82	87.5
43N121	Offagne	110	130.5	136	136.5	104	105.5	147	154	158	130	101	51.5	85	90.5
43N132	Habay-La-Neuve	103.5	137.5	135.5	125.5	103.5	106.5	157	153.5	153	136.5	93	52	74	89.5
43R221	Herstal	100	134.5	143	135.5	104	127	147	190.5	177	98.5	103.5	55	63.5	72
43R222	Liège (ISSeP)	106	135.5	138.5	131.5	110.5	129	148.5	174.5	184	105.5	102	62	68.5	73
43R240	Engis	100	124	125.5	121	103	125	149.5	174	176.5	92.5	91.5	46	58	63.5
43R401	Namur	99.5	125	132	129.5	100	123	151.5	158.5	173.5	107	97.5	50	71	70.5
45R502	Lodelinsart	114	130.5	124.5	127.5	106.5	136	142.5	165	185.5	103	101.5	37.5	61	58

Interpolated spatial average in :
Brussels	105	133	130	120	105	140	138	166	142	90	99	47	60	63
Flanders	106	136	141	121	104	145	155	188	128	89	99	53	64	72
Wallonia	105	127	125	123	105	119	141	163	162	111	99	47	67	72
Belgium	105	131	132	122	105	130	147	174	147	101	99	50	65	72

% of the population exposed to O₃ concentrations > 180 μg/m³ in:
Brussels	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%
Flanders	0%	0%	0%	0%	0%	0%	1%	68%	<1%	0%	0%	0%	0%	0%
Wallonia	0%	0%	0%	0%	0%	0%	<1%	4%	4%	0%	0%	0%	0%	0%
Belgium	0%	0%	0%	0%	0%	0%	<1%	41%	1%	0%	0%	0%	0%	0%

% of the population exposed to O₃ concentrations > 240 μg/m³ in:
Brussels	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%
Flanders	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%
Wallonia	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%
Belgium	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%

Color legend: Kleurlegende

These data are not validated : they should not be used for any study whatsoever
The use or publication of the data is allowed only when the source (www.irceline.be) is acknowledged